Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Interest income	$ 83,721	$ 63,886	$ 170,832	$ 117,365
Gain on sales of loans	260	2,813	1,744	9,924
Other revenue	2,670	2,803	6,967	4,828
Gross revenue	86,651	69,502	179,543	132,117
Cost of revenue:
Provision for loan losses	32,733	32,271	78,913	57,708
Funding costs	11,616	8,374	22,893	14,096
Total cost of revenue	44,349	40,645	101,806	71,804
Net revenue	42,302	28,857	77,737	60,313
Operating expense:
Sales and marketing	15,368	16,757	30,187	33,305
Technology and analytics	14,769	13,757	30,212	27,844
Processing and servicing	4,826	4,865	9,361	9,080
General and administrative	9,590	12,149	21,477	21,858
Total operating expense	44,553	47,528	91,237	92,087
Loss from operations	(2,251)	(18,671)	(13,500)	(31,774)
Other expense:
Interest expense	(318)	(37)	(671)	(75)
Total other expense	(318)	(37)	(671)	(75)
Loss before provision for income taxes	(2,569)	(18,708)	(14,171)	(31,849)
Provision for income taxes	0	0	0	0
Net loss	(2,569)	(18,708)	(14,171)	(31,849)
Net loss attributable to noncontrolling interest	1,071	813	1,615	1,381
Net loss attributable to On Deck Capital, Inc. common stockholders	$ (1,498)	$ (17,895)	$ (12,556)	$ (30,468)
Net loss per share attributable to On Deck Capital, Inc. common shareholders:
Basic and diluted (in dollars per share)	$ (0.02)	$ (0.25)	$ (0.17)	$ (0.43)
Weighted-average common shares outstanding:
Basic and diluted (in shares)	72,688,815	70,712,142	72,276,734	70,588,784
Comprehensive loss:
Foreign currency translation adjustment	$ 36	$ (326)	$ 436	$ 192
Comprehensive loss	(2,533)	(19,034)	(13,735)	(31,657)
Comprehensive loss attributable to noncontrolling interests	(16)	147	(196)	(85)
Net loss attributable to noncontrolling interest	1,071	813	1,615	1,381
Comprehensive loss attributable to On Deck Capital, Inc. common stockholders	$ (1,478)	$ (18,074)	$ (12,316)	$ (30,361)